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That’s it, I’m confused! Gear oil

Discussion in 'Heavy Duty' started by DarthMegaHD, Mar 7, 2020.

  1. DarthMegaHD

    DarthMegaHD Senior Member Military

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    trust me, I’ve been searching the forums so please don’t tell me about using the search to find a post you saw one time. So it’s clear the favorite gear oils are amsoil severe gear and redline. Got it. Hard to find locally but I’ll order. But the weights? I have 4.10s in my 2500 and the manual recommends 75w95 but it seems most recommend 75w140 for the rear? Why would you want a different weight for the rear when they’re the same ratio? Even if the answer is “because science” that’s fine, I just don’t want to buy the wrong weight. Also, last thing. It seems the amount of oil differs quite a bit. I know there’s a fill line on the back plate. The amount to this line I’ve gathered is anywhere between 2.5 and 5 quarts for the rear. If both front and rear were to take the same weight it could save some headache and I’d just buy 3 gallons or something but that’s not the case. Many on here recommend different weights. Someone please spell this out very clearly for me, I’m a Marine I need very clear instructions lol. I’ve watched the YouTube videos and they vary or leave details out.

    I’m leaning towards 3 quarts of redline 75w95 for the front and 4 quarts of redline 75w140 for the rear. If anyone thinks I’m dead wrong or need this or that tweak, by all means please let me know, thanks
     
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  2. madtrucker2016

    madtrucker2016 Senior Member

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    Yeah you are correct to put only the correct weight oil in the rear,because if that puppy goes it,s going to break the bank. I really don't know the weight and amount I have 392 gears in rear, so I have to look up my oil too. Good luck.
     
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  3. dexter

    dexter Senior Member

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    I have the same gears.
    The manual I have says:
    Front and Rear Axle – 2500/3500 Models
    We recommend you use SAE 75W-90 HD Ram GL-5 Synthetic Axle Lubricant. Limited slip additive is not required for Limited-Slip Rear Axles.

    THere is a lot of mis information on the net.

    Change your fluid at recommended intervals and you will be fine.
    I tow a lot and use the 90.
     
  4. Ionicbrick

    Ionicbrick Senior Member

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    Same here. I put 75w90 in mine and tow a lot too.


    Sent from my iPhone using Tapatalk
     
  5. SeppW

    SeppW Junior Member

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    My manual specifies Synthetic, GL-5 SAE, 75W-90 for front and rear with no friction modifier.
     
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  6. DarthMegaHD

    DarthMegaHD Senior Member Military

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    So how many quarts do I need for front and back?
     
  7. dexter

    dexter Senior Member

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    Do you us to change it for you also?

    Check your manual.
     
  8. G. Mcpherson

    G. Mcpherson Senior Member

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    7 qts. The owner's manual gives you capacity.
     
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  9. DarthMegaHD

    DarthMegaHD Senior Member Military

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    Thanks for the help, gmac. I appreciate you
     
  10. ALRedneck

    ALRedneck Senior Member

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    Go over to the Power Wagon forum. Scroll down about 25 threads and there is a long, detailed discussion with pics.
     

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